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Foliation is the planar arrangement of minerals in deformed metamorphic rocks.

TypesEdit

Gneissic Banding - alternating layers of light and dark grains in the rock.

Schistosity - Alignment of platy minerals in the rock.

Cleavage - rock splits parallel to aligned fine grains in the rock.


Classification of FoliationsEdit

A continuous (penetrative) foliation deforms all of the grains in the rock. This can happen with course grains (schist) or fine grains (slate). Another type is a spaced (non-penetrative) foliation which leaves domains of undeformed material within the rock.

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